278045555 has 4 divisors (see below), whose sum is σ = 333654672. Its totient is φ = 222436440.

The previous prime is 278045549. The next prime is 278045567. The reversal of 278045555 is 555540872.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-278045555 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27804551 + ... + 27804560.

It is an arithmetic number, because the mean of its divisors is an integer number (83413668).

Almost surely, 2^278045555 is an apocalyptic number.

278045555 is a deficient number, since it is larger than the sum of its proper divisors (55609117).

278045555 is an equidigital number, since it uses as much as digits as its factorization.

278045555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55609116.

The product of its (nonzero) digits is 280000, while the sum is 41.

The square root of 278045555 is about 16674.6980482406. The cubic root of 278045555 is about 652.6875353359.

The spelling of 278045555 in words is "two hundred seventy-eight million, forty-five thousand, five hundred fifty-five".